Solving the problem of emergency shutdowns
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Why is it necessary to shut down the operation urgently, turn off the converter, and cut off the steam supplied to the furnace at a temperature higher than that at which the conversion catalyst hydrolyzes? What exactly is catalyst hydrolysis? What is the hydrolysis temperature?
Hydrolysis occurs when the catalyst comes into contact with water, causing the acidic and basic active substances on the catalyst to precipitate and resulting in the deactivation of the catalyst. Therefore, the steam must enter the furnace in a gaseous state, that is, at a temperature above that of saturated steam, usually around 220°C or higher.
Does it mean that when steam carrying water enters the catalyst, it causes changes in the catalyst’s mechanical strength? Is this the correct way to understand hydrolysis? Also, are the conditions for stopping gas supply the same as those during gas conversion? (Conversion: 450 at the inlet, 650 at the outlet; medium-pressure bed layer: 200)